On 22/05/2019 14:45, Sylvia Else wrote:
> On 22/05/2019 10:47 pm, Keith Stein wrote:
>> = c + v
......................
> And you've also been told before that in the YOU frame, the time light
> takes for the journey is not tB - tA. That's the time it takes in the
> frame of the lab. You're assuming that time is frame independent.
>
> Sylvia.
Yes indeed Sylvia, we seem to be destined to go in some sort of
endless loop.......
.so here we go again.............
On 13/05/2019 07:38, Sylvia Else wrote:
> On 13/05/2019 4:06 pm, Keith Stein wrote:
>> On 13/05/2019 04:22, Sylvia Else wrote:
>>> On 13/05/2019 12:10 am, Keith Stein wrote:
>>>> On 12/05/2019 13:23, Sylvia Else wrote:
>>>>> On 12/05/2019 8:03 pm, Keith Stein wrote:
>>>>>> On 12/05/2019 09:34, Sylvia Else wrote:
>>>>>>> On 12/05/2019 3:24 pm, Keith Stein wrote:
>>>>>>>> On 12/05/2019 02:59, Paparios wrote:
>>>>>>>>
>>>>>>>>> .. the constant speed of light is an experimental result
>>>>>>>>
>>>>>>>> No the experimental result is 'c+v'
>>>>>>>> where v is the velocity of the observer.
>>>>>>>>
>>>>>>>> Consider
>>>>>>>> any determination of the one way speed of light in any
laboratory.
>>>>>>>>
>>>>>>>> A B
>>>>>>>> light-----><--------L----------> <--YOU v m/s
>>>>>>>> tA tB
>>>>>>>>
>>>>>>>> Speed of light in lab = Distance/Time = L/(tB-tA) = c m/s
>>>>>>>>
>>>>>>>> Now YOU walk towards B from the right at v m/s
>>>>>>>> Note that in your frame of reference the point B is moving,
>>>>>>>> and therefore the light travels an extra distance = v(tB-tA) m,
>>>>>>>> which is the distance traveled by B as the light travels
from A to B
>>>>>>>>
>>>>>>>> Speed of light relative to YOU = Distance / Time
>>>>>>>> = L + v*(tB - tA) / (tB -tA)
>>>>>>>> = L/(tB-tA) + v
>>>>>>>> = c + v
>>>>>>
>>>>>>> That's not an experiment, that's a description of one, together
with a description of how you think it would turn out.
>>>>>>
>>>>>> Indeed it is a description of an experiment, and if 'YOU' walking
>>>>>> towards the clocks does not affect the readings on those clocks,
>>>>>> as they record the time at which light passes A and B i.e. TA
and TB,
>>>>>> then we can be 100% certain that that is how it would turn out
Sylvia.
>>>>>>
>>>>>> How do you think the experiment would turn out eh?
>>>>
>>>>> You're assuming that time for "You" is tB - tA. You have no
reason to make that assumption. If "You" measure that time, "You" will
find that it is not tB - tA.
>>>>
>>>> How do you propose to measure the time the light arrives at points A
>>>> and B without utilizing clocks situated at points A and B Sylvia ?
>>>
>>> I'd have two clocks, labelled YouA and YouB, stationary relative to
"YOU" and synchronized in the "YOU" frame, They would be positioned
such that YouA passes A when the light passes A, and YouB passes B when
the light passes B. I would then divide the difference in times shown by
the clocks when they pass the two points, by the distance between them
as measured in the "YOU" frame.
>>
>> How do you arrange that the clock YouA passes point A at exactly the
same instant that the light reaches point A, and how do you know it did?
>
> It's not exactly difficult. I'd just calculate the required
positions. If you don't like that, it could be done by a process of
trial and error using a binary cut, or similar, technique.
>
> As for knowing that I'd done it correctly, if we assume that we're
using a short pulse of light, then just reflect a bit of light off the
beam sideways at A and B. If the clock arrives there at the correct
time, it will see pulse in the reflection. If it arrives at the wrong
time, it won't.
>
> You'll probably argue that you weren't intending that it be a pulse,
but it has to be something other than a continuous beam, or you can't
determine when it reaches A and B anyway.
>
> You seem to think that just because you cannot envisage a way of
doing something, that thing cannot be done.
>
>> Can you give a reference to any experiment ever performed in this way ?
>> Of course you can't, because as you must surely know Sylvia your
proposed experimental technique is totally impractical - silly even.
>
> No, of course I can't - as you say, it's completely impractical, as
it was from the moment you described it. But it's hardly reasonable for
you to propose that an impractical experiment that will allegedly prove
you position, and then complain about the impracticality when the
experimental protocol is corrected in a way that undermines your argument.
>
>>
>> > The result would be the speed of light in the "YOU" frame.
>>
>> And as we both know Sylvia, if the technique was feasible, which it
isn't, the result would be 'c', because you synchronized the clocks
>> in the "YOU" frame by ASSUMING the velocity of light was 'c' eh!
>
> I'd probably just position them together at the mid-point between
their eventual positions in the "YOU" frame, synchronized them, and them
move them slowly to the positions required for the measurements. In your
world, they would definitely remain synchronized, so unless you want to
argue that they wouldn't, that settles the matter.
>
>>
>>
>> >>>>>> On 12/05/2019 02:59, Paparios wrote:
>> >>>>>>> .. the constant speed of light is an experimental result
>>
>> Anyway i do thank you for your efforts Sylvia, and making it very
>> clear that what Dr.Paparious should have said was:
>>
>> "IF CLOCKS ARE SYNCHRONIZED BY ASSUMING THE VELOCITY OF LIGHT IS c,
>> then, in the frame of reference in which those clocks have been
>> synchronized, those clocks will indicate the speed of light is c."
>
> The statement is true, but it's not the only way to synchronize
clocks in a frame, and not all ways involve assumptions about the speed
of light.
>
>>
>> which is hardly an "experimental result" as he claimed, is it Sylvia ?
>
> I don't know whether he claimed it to be an experimental result or
not, but it doesn't seem relevant to this discussion either way.
On 13/05/2019 07:38, Sylvia Else wrote:
> On 13/05/2019 4:06 pm, Keith Stein wrote:
>> On 13/05/2019 04:22, Sylvia Else wrote:
>>> On 13/05/2019 12:10 am, Keith Stein wrote:
>>>> On 12/05/2019 13:23, Sylvia Else wrote:
>>>>> On 12/05/2019 8:03 pm, Keith Stein wrote:
>>>>>> On 12/05/2019 09:34, Sylvia Else wrote:
>>>>>>> On 12/05/2019 3:24 pm, Keith Stein wrote:
>>>>>>>> On 12/05/2019 02:59, Paparios wrote:
>>>>>>>>
>>>>>>>>> .. the constant speed of light is an experimental result
No the experimental result is 'c + v' Sylvia..see above eh!
keith stein